基于SNR的OFDMA上行链路干扰消除方法

Interference cancellation based SNR in uplink OFDMA system

提出了正交频分多址(OFDMA)上行链路中基于信噪比最优顺序的快速串行干扰消除方法.该方法利用干扰矩阵的各列近似正交特性,按照它们的相关程度得到解调后信噪比最优的串行干扰消除子载波排列.与其他OFDMA上行链路干扰消除方法相比,它避免了Moore-Penrose伪逆矩阵的求解,具有解调后所有子载波上信号的信噪比联合最优、计算量低的特点,且可以应用于任何子载波分配策略中.仿真结果证明了该方法的正确性.

A successive interference cancellation （SIC） algorithm based on signal-to-noise ratio （SNR） was proposed to mitigate the interference in the uplink orthogonal frequency division multiple access （OFDMA） systems. An optimal permutation of the detection order based on post SNR can be first found for the almost orthogonality of the columns of the interference matrix. Compared with other interference cancellation algorithms, there is no need for the Moore-Penrose pseudo inverse operation and the algorithm is optimal on the means of SNR of all the subcarriers and can be applied in generalized carrier assignment scheme. The validity of the proposed algorithm is validated by the numerical simulations.